In brief:
When was Plan B

used. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex.

It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes. A correctly used condom will improve efficacy beyond those numbers.

In brief:
When was Plan B

used. Plan B One-Step is up to 89 % effective when taken within 72 hours (3 days) after unprotected sex.

It can reduce chance of pregnancy by up to 95% if used within 24 hours. It continues to reduce the risk of pregnancy up to 120 hours (5 days) after unprotected sex, but is less effective as time passes. A correctly used condom will improve efficacy beyond those numbers.
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